* dwarf2out.c (free_AT): Delete.
(remove_AT): Update string ref counts.
(remove_child_TAG): Don't call free_die.
(free_die): Delete.
(break_out_includes): Don't call free_die on DW_TAG_GNU_BINCL
or DW_TAG_GNU_EINCL.
(prune_unused_types_walk_attribs): Reset string refcounts.
(prune_unused_types_update_strings): New.
(prune_unused_types_prune): Don't make unnecessary stores. Don't
call free_die. Do call prune_unused_types_update_strings.
(prune_unused_types): Empty debug_str_hash.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@113012 138bc75d-0d04-0410-961f-82ee72b054a4